Fix:

error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
--- src/wn.c.orig	2006-11-30 15:40:26.000000000 -0600
+++ src/wn.c	2024-09-29 02:19:34.000000000 -0500
@@ -129,6 +129,7 @@
        printsearches(char *, int, unsigned long);
 static int error_message(char *);
 
+int
 main(int argc,char *argv[])
 {
     display_message = error_message;